# Parle\Lexer::callout

(PECL parle >= 0.7.2)

Parle\Lexer::callout — Define token callback

### Beschreibung

public Parle\Lexer::callout(int `$id`, callable `$callback`): void

Define a callback to be invoked once lexer encounters a particular token.

### Parameter-Liste

`id`

  Token id.

`callback`

  Callable to be invoked. The callable doesn't receive any arguments and its return value is ignored.

### Rückgabewerte

Es wird kein Wert zurückgegeben.

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